Smart Workout Diary

Lying Knee Tuck

The lying knee tuck is a bodyweight abdominal exercise performed on your back by drawing the knees toward the chest and then extending the legs with control. It primarily trains the abs while the hip flexors assist. It supports core strength and control without requiring equipment.

Demonstration

Demonstration: Lying Knee Tuck

Instructions

  1. Lie on your back with your arms by your sides and your legs extended together.
  2. Brace your abdomen and lift your feet slightly from the floor if comfortable.
  3. Draw both knees toward your chest, keeping the movement smooth and controlled.
  4. Extend your legs back out without letting your lower back arch excessively.
  5. Repeat while maintaining control, then lower your feet to finish.
Muscle Group
Abs
Other Muscle Groups
Hip Flexors
Type
Calisthenics
Mechanics
Compound
Laterality
Bilateral
Movement Mode
Dynamic
Equipment
Body Only
Difficulty
Beginner

Technique tips

  1. Keep your lower back gently pressed toward the floor as your legs extend.
  2. Shorten the leg extension if you cannot maintain a stable trunk position.
  3. Move deliberately rather than using momentum to pull the knees in.
  4. Exhale as you draw the knees in and inhale as you extend the legs.
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